The first digital computer and what most people think of as a computer was called the ENIAC, built during World War 2 (1943-1946). Early computers like the ENIAC used vacuum tubes and were large and only found in business, universities, or government. Later, computers began utilizing transistors as well as smaller and cheaper parts that allowed the common person to own a computer.
A computer is a type of machine. It doesn't have a brain like us and it can't think or have ideas. A computer is a general purpose device that can be programmed to carry out a set of arithmetic or logical operations automatically. It consists of two basic parts hardware and software. A computer consists of processing element, typically a central processing unit (CPU), and some form of memory. A hardware consists of a processor, mouse, keyboard and monitor.
The term computer is derived from the Latin term 'computare', this is to calculate or programmable machine. Computer can not do anything without a program. It represents the decimal numbers through a string of binary digits.
Today, computers help make jobs that used to be complicated much simpler. For example, you can write a letter in a word processor, edit it anytime, spell check, print copy and send it to someone across the world in a matter of seconds. All of these activities would have taken someone days, if not months, to do before computers.
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